25455661 has 16 divisors (see below), whose sum is σ = 31868928. Its totient is φ = 19753200.

The previous prime is 25455653. The next prime is 25455671. The reversal of 25455661 is 16655452.

It is a cyclic number.

It is not a de Polignac number, because 25455661 - 2³ = 25455653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25455601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23416 + ... + 24478.

It is an arithmetic number, because the mean of its divisors is an integer number (1991808).

Almost surely, 2^25455661 is an apocalyptic number.

It is an amenable number.

25455661 is a deficient number, since it is larger than the sum of its proper divisors (6413267).

25455661 is a wasteful number, since it uses less digits than its factorization.

25455661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1392.

The product of its digits is 36000, while the sum is 34.

The square root of 25455661 is about 5045.3603439199. The cubic root of 25455661 is about 294.1675699516.

The spelling of 25455661 in words is "twenty-five million, four hundred fifty-five thousand, six hundred sixty-one".